ウェーブレット変換による地震動の時間-周波数解析

概要

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Behaviors of structures during an earthquake are dominated by the accumulation and rate of input energy in frequency domain as well as in time domain. However, such energy parameters have not been related to time-frequency characteristics of earthquake ground motions. This paper proposes a wavelet analysis as a tool to clarify the relationships between time-frequency characteristics of earthquake motions and behaviors of structures. First, the relationships between wavelet coefficients deduced from wavelet transform and time history of energy input are derived. Then, the proposed time-frequency analysis is applied to the motions recorded during the 1995 Hyogoken-nanbu Earthquake, which reveals the relationships between epicentral distance and input energy both in frequency and time domains.
1998-12-30